Being an East Coast's beach reguLar, i can attest to this norm; esp on weekends.Infact i beLieve there's a 'syndicate' of Indons' encLavement right after the ChaLets.Those tentages are usuaLLy erected some 5-10metres apart; generaLLy about 20+ of them in aLL..chances they are operated by some fLy-by-night Batam operators.The dead teLL taLe signs are the cartons of Made in Indonesia mineraL waters stacked up outside these 'mini kampungs'..
You can see Foreign workers going in & out of the tents, after some smaLL taLks with the KepaLa..